Author Question: The S action qualifier letter ________. A) Is never used in process systems B) Initiates a ... (Read 119 times)

formula1 · **on:** Jul 28, 2018

The S action qualifier letter ________.

A) Is never used in process systems
B) Initiates a process action that lasts for more than one step
C) Is always used in discrete systems
D) Must have a timer to set the on time for the action

Question 2

Which of the following elements does not affect how a ladder logic program is developed?

A) The choice of XIC and XIO instructions for the PLC program.
B) The requirement for current sinking or sourcing inputs and outputs.
C) The contact type and active state of the input field devices.
D) The type, direct or inverse acting, and active state of the output field devices.